Trouble with LinuxCNC and Gantry stepper motor setup.

Ahhh,

When you say run y axis and a axis in tandem do you mean you have a 4th rotary axis (for cutting pipe) or just have 2 motors on the gantry that you need to move together?

For the first see my comment above......
For the second

Make a new config, select your "a axis" as tandem Y.

You will need homing switches on each of the 2 y axis so the joints can square themselves before becoming an axis. Once they are homed both will move at the same time and jog like normal.

No gcode changes for this one.

So, I will need to install physical limit switches to the table for this homing setup?
Is there a tutorial and were for wiring limit switches correctly to the control board ST-V3. As I do not have any switches install at this time. It never needed them when I had the table setup for Plasma cutting. Now I have changed to Router it seems that this is an issue.

You do not absolutely need to have switches on a gantry
but if not, you need to use an "immediate" homing setup:


linuxcnc.org/docs/html/config/ini-homing.html#_immediate_homing